ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Under the default configuration, versions of `sanitize-html` prior to 2.17.4 can turn attacker-controlled content inside a disallowed `xmp` element into live HTML or JavaScript. This is a sanitizer bypass in the default `disallowedTagsMode: 'discard'` path and can lead to stored XSS in applications that render sanitized output back to users. Version 2.17.4 patches the issue.

Affected: npm: sanitize-html

### Summary Under the default configuration, `sanitize-html` can turn attacker-controlled content inside a disallowed `xmp` element into live HTML or JavaScript. This is a sanitizer bypass in the default `disallowedTagsMode: 'discard'` path and can lead to stored XSS in applications that render sanitized output back to users.

### Details In `sanitize-html@2.17.3`, the default `nonTextTags` list includes only `script`, `style`, `textarea`, and `option` in `index.js` lines 138-142. That means disallowed `xmp` tags are not treated as "drop the entire contents" tags.

Later, in the `ontext` handler at `index.js` lines 569-577, the code special-cases `textarea` and `xmp` and appends their text content directly to the output without escaping:

```js } else if ((options.disallowedTagsMode === 'discard' || options.disallowedTagsMode === 'completelyDiscard') && (tag === 'textarea' || tag === 'xmp')) { result += text; } ```

Because `htmlparser2` treats `xmp` as a raw-text element, markup inside `xmp` is parsed as text on input but becomes live markup again once it is appended unescaped to the sanitized output.

This creates a default sanitizer bypass. For example, a disallowed `<xmp>` wrapper can be used to smuggle `<script>` or event-handler payloads through sanitization.

The README also appears to contradict the implementation. In the "Discarding the entire contents of a disallowed tag" section, the documented exception list names only `style`, `script`, `textarea`, and `option…

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